This symbol is the Poison symbol. When this sign is on an item, that means that no one should in their mouth. If they do, it could poision them and it could kill them.
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This is the Radioactive symbol.This symbol means that an item with this sign on it, should'nt be touched without gloves. If it comes in contact with human skin, it could cause illnesses or diseases such as cancer.
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This is the Flammable symbole. This symbol means that no item with this on it should be near flames. If it does, it can cause a major fire.
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This is the sharp object symbol. This symbol appears when the danger of severe cuts caused by a sharp object exists.
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This is the thermal safety symbol. This symbol appears as a note to be carfeul when handling heated objects.
If they do, it could poision them and it could kill them.
Refrences
http://images.search.yahoo.com/search/images;_ylt=ApVVqRer8y8a6P8Oh8KgfxabvZx4?fr=yfp-t-701-s&toggle=1&cop=mss&ei=UTF8&p=lab%20safety%20symbols
date:8-20-11
http://images.search.yahoo.com/search/images;_ylt=A0PDoS5coFNO52AAO1uJzbkF?p=science%20safety%20lab%20equipment&fr=yfp-t-701-s&ei=utf-8&n=30&x=wrt&fr2=sg-gac&sado=1
date:8-20-11
safety lab contract
http://images.search.yahoo.com/search/images;_ylt=A0PDoTGboFNOAmAAafGJzbkF?p=no%20running%20sign&fr=yfp-t-701-s&ei=utf-8&n=30&x=wrt&fr2=sg-gac&sado=1
date:8-20-11
http://images.search.yahoo.com/search/images;_ylt=A0PDoTA8oVNOTwwAgyqJzbkF?p=wear%20goggles%20sign&fr=yfp-t-701-s&ei=utf-8&n=30&x=wrt&fr2=sg-gac&sado=1
date:8-20-11